Composition of matter employed for hardening and tempering steel.



UNITED STATES PATENT onnron.

BARNAB AS J. CASTE RLINE, OF PORTLAND, OREGON, ASSIGNOR TO OASTERLINE CUTLERY COMPANY, PORTLAND, OREGON-A CORPORATION.

. COMPOSITION OF MATTER EMPLOYED FOR HARDENING AND TEMPERING STEEL.

- Specification of Letters Patent.

Patented Feb. 18, 1908.

To all 'whom it may concem: Be it known that I, BARNABAS J. CASTER- LINE, a citizen of the United States, and resident of Portland, county of Multnomah, and State of Oregon, have invented certain new and useful Im rovements in a Composition of Matter to be Employed for Hardening and Tempering Steel, of which the following is a specification.

This invention relates to a composition of matter to be employed for hardening and tempering steel; the object of the invention being to provide -a. composition of the character named Which will impart to the steel a maximum degree of hardness without impairing its resiliency or malleability.

. My composition consists of the following ingredients, combined in the proportions stated, viz.:

Salt; l 2lbs. Saltpeter -1-lb. Carbonate of iron lb. Borax Mb. Wood a'lcohol -.'-15 pints. G1 cerin. 5*quarts. 0' gallons.

These ingredients are mingled by agitation, until a thoroughly homogeneous fluid compound is produced.

I may use any adaptable oil in the above named composition, either animal or vegetable, such as: linseed oil, cotton seed oil, Chinanut oil, sweet. oil, fish oil, sperm oil and lard oil. 4 To use the composition as a means for hardening and tempering a iven article of steel the same is -first, 'heate to a cherryred heat; then immersed into the above named solution and kept submerged for the same length of time required to allow water to subside and discontinue bubbling when a piece of cherry-red heated steel is submerged therein; said period of time'will be readily understood by those familiar with the art of tempering metals. After being allowed to cool in the solution for a period as stated above the article is coated with tallow and then heated slowly, b holding it over a slow fire, until drawn to t 1e degree ofmalleability required, the period of time being varied according to the uses for which the article being tempered is intended.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

IL Theherein described composition of matter for hardening and tempering steel, consisting of the following i edients, viz.: salt, saltpeter, carbonate 0 iron, boraX, wood alcohol, glycerin and oil; substantially as described.

2. The 'herein described composition of matter for hardening and tempering .steel consisting of the following ingredients, in the following relative proportions, viz.: of salt, two pounds; saltpeter, one quarter of a pound; carbonate of iron, one quarter of a pound; vborax, one half of a pound; wood alcohol, fifteen pints; glycerin, five quarts; oil, five gallons.

In testimony that, I claim the foregoing as my invention, I have signed my name in presence of-two witnesses, this 24th day of May 1907. v

BARNABAS J CASTERLIN E.

Witnesses:

M; J. CURTIS, FRANK MOTTER. 

